The ISL3247xE are fault-protected, extended common-mode range differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 bus pins (driver outputs and receiver inputs) are fault protected against overvoltages up to ±60V and are protected against ±16. 5kV ESD strikes without latch-up. Additionally, these transceivers operate in environments with common-mode voltages up to ±15V (exceeds the RS-485 requirement), making this fault-protected RS-485 family one of the most robust on the market. The transmitters (Tx) deliver an exceptional 2. 5V (typical) differential output voltage into the RS-485 specified 54Ω load. This yields better noise immunity than standard RS-485 ICs or allows up to six 120Ω terminations in star topologies. The receiver (Rx) inputs feature a full fail-safe design that ensures a logic high Rx output if the Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. The Rx outputs feature high drive levels; typically, 15mA at VOL = 1V (to ease the design of opto-coupled isolated interfaces). Half duplex (Rx inputs and Tx outputs multiplexed together) and full duplex pinouts are available. For a fault-protected RS-485 transceiver with a ±25V extended common-mode range, see the ISL32490E and ISL32483E datasheets.


  • Fault protected RS-485 bus pins: Up to ±60V
  • Extended common-mode range: ±15V
    • larger than required for RS-485
  • 1/4 unit load for up to 128 devices on the bus
  • ±16.5kV HBM ESD protection on RS-485 bus pins
  • High transient over-voltage tolerance: ±80V
  • Full fail-safe (open, short, terminated) RS-485 receivers
  • High Rx IOL for opto-couplers in isolated designs
  • Hot plug circuitry: Tx and Rx outputs remain three-state during power-up/power-down
  • RS-485 data rates: 250kbps to 15Mbps
  • Low quiescent supply current: 2.3mA
  • Ultra low shutdown supply current: 10µA




  • Utility Meters/Automated Meter Reading Systems
  • High Node Count RS-485 Systems
  • PROFIBUS® and RS-485 Based Field Bus Networks, and Factory Automation
  • Security Camera Networks
  • Building Lighting and Environmental Control Systems
  • Industrial/Process Control Networks


Type Title Date
Datasheet PDF 1.34 MB
Training PDF 719 KB
Training PDF 762 KB
Brochure PDF 5.20 MB 日本語
Training PDF 208 KB
Brochure PDF 2.95 MB
Training PDF 405 KB
Training PDF 239 KB
Technical Brief PDF 266 KB 简体中文
Application Note PDF 365 KB
Application Note PDF 207 KB
Application Note PDF 474 KB
Application Note PDF 366 KB
Technical Brief PDF 188 KB
Report PDF 438 KB
Product Change Notice PDF 266 KB
Application Note PDF 178 KB
Price Increase Notice PDF 208 KB
Other PDF 156 KB
White Paper PDF 246 KB 简体中文
Application Note PDF 513 KB
Application Note PDF 826 KB
Other PDF 253 KB
Application Note PDF 443 KB
Application Note PDF 582 KB
Application Note PDF 440 KB
Product Change Notice PDF 152 KB
Application Note PDF 338 KB
Application Note PDF 365 KB
Application Note PDF 375 KB
Other PDF 254 KB
Application Note PDF 559 KB
32 items

Design & Development



Type Title Date
Model - IBIS IBS 27 KB
1 item